For 2006, the BMW X3 comes in one model, the 3.0i. (The 2.5-liter model was discontinued.) The X3 3.0i sports a 225-horsepower 3.0-liter inline-6 hooked to BMW's xDrive all-wheel drive. A six-speed manual transmission is standard, while a five-speed automatic Steptronic is a no-charge option.